KB: Short Circuit errors between polygons and holes in old project

Solution Details

There has been an improvement  of the electrical clearance rule: 
"57719    Improved hole clearance detection for the Clearance rule, now checking clearance to the pad hole in case the pad has no annular ring (pad hole is greater than or equal to pad diameter)."
https://www.altium.com/documentation/altium-designer/public-release-notes

Before Altium Designer 24, the holes without copper in it would get an annual ring, that will then keep the polygon away from the hole.

Since the improvement, no annular ring is placed, so the actual clearance between the hole and the polygon is 0 and this creates a shortcut error.

In order to prevent this add some clearance value to the cell hole against copper:


Another option would be to disable the improvement by going to the Preferences ► System ► General ►[Advanced...] and disable the setting: 
PCB.Rules.HoleClearance:


A restart of the Altium Designer is needed. Then repour the polygon(s).